Drill tool retainer



16, 1932- e. RAUBERSTRAUCH DRILL TOOL RETAINER Filed 001)., 4, 1929 INVENTOR GZOKEE RAUBFRflJP/IUCH BY TORNEY Patented Aug. 16, 1932 i UNITED STATES PATENT- oF FI E j enoaen RAUBERSTRVAUJGH, or QLEVELAND, massmmmo THEVCLEVELVANAD noox DRILL COMPANY, oF'cL vELnNnoHIo, A oonro u rron or 01110 7 Drum. 'rooL RETAINER Application filed umber 4, me. Serial no; 397,181.

The present invention relates broadly to rock drills of the percussion type and'more specifically to improvements in tool retainers. 7

One of the objects of this invention is to provide a releasable tool retainenwhioh -,ls simple in design, economic of manufacture, and susceptible of ready manipulation.

Another object is to provide a tool retainer which is organized to prevent the accidental 10 disengagement ofthe tool-fromthe drill.

Another object of the invent on is to pro vide a tool retainer which can be readily i affixed to or removed from the, drill. ,7

Other objectsrand advantages more or less 5 ancillary to the foregoing and themanner in which the various objects are attained reside in the specific construction and aggroupment of. the elements peculiar to the structur,e as will become apparent from a more certain specific combinations of parts and specific constructions indicative of the-scope and spirit of the invention. .In the drawing which illustrates a preferred embodiment of theinvention Fig. 1 is an; elevational view of the lower a head 10, constituting the lower .portion of v the casing of a percussive rock drill, and

provided with oppositely disposed apertured .ears 11 receiving bolts 12 for securing the head to the upper portions of the casing. A pair of diametrically] opposed open ears 18 4 are formedon the head at'right angles to complete examination of this specification,v in the claims ofwhich there are assembled the earsf11, each of the ears 13 being provided with alpair of spaced notches 14 and 15. V Arpairof inclined slots 16, having substantially parallel fioor'portions, are formed on opposite sides of the head beneath the cars 13. The inner termini of the slots 16 consist of a pair of diametrically opposed circular recesses 17, depressed slightly below the levels of the floor portions of the respective slots 16., v The tool retainer comprises a yoke 18 have ing a substantially semi-annular loop 19 and integral parallelarms 20 extending from the :ends of the loop at substantially right. angles to the plane thereof. The arms 20 are formed with inwardly extending trunnions 21 adapt ed to be 'journall'ed in the recesses 17. :The free ends'of the arms 20 beyond the trunnions 21 are arranged tofit within the cars 13, and to resiliently engage in the notches 14:01'15. 7

As is customary in machines of this type, the'head 10 is provided with an axial opening to slidably receive the 'tool22; The tool is formed with an integral collar 23 which engages the lower end of the head 10 w limit its sliding motion inwardly, WVhen'the machine is being operated, .the tool -rests upon the. work andthe body of the machine is supported by the tool. -However, whenoperation ceases andit is desired to lift the drill from the work, some means must beLprQ- vided to restrain thetool from sliding from the head and remaining in the hole which has been formed' Accordingly, the loop 19 is formed ofsuch a diameter as to engage the 1 collar 23 and restrain the tool from sliding outwardly from the head when the; free ends of the arms 20 are retained in the notches, 14, and is spaced from the lower edge of the head a sufiicient distance to permit reciprocation of the tool during normal operation h o -'1 Y When it is desired to remove the tool from the drill the parts being in the position; shown in full lines in Figure 1, the loop 19 is forced away from the tool to the dotted line position in Figure 1, the ends ofthe arms 20 snapping out of the notches 14 and into the spaced notches 15. To again lock the tool in position, the yoke is forced inwardly to its vertical position. When it is desired to remove the retainer from the drill, the yoke is forced outwardly until the arms 20 pass both sets of notches and clear the ears 13. The ends of the arms 20 are then spread until the trunnions 21 clear the recesses 17 and rest upon the floors of the slots.16.. The trunnionsare then slid outwardly through theslots 16. To replace the retainer, the trunnions are placed in the slots 16 by spreading the arms, and pushed inwardly through the slots until they snap into the recesses 17.

When the retainer is'ineith'er of i tsnormal positions,.with the arms 20 engaged in either pair of notches let or 15 it cannot be removed or accidentally disengaged from the drill, since the ears 13 prevent spreadin of the arms sufiiciently to release the trunnions fi'om' the recesses l V Although the foregoing description is neeessaril-y of a detailed character in order to completely set forth the invention, it is to he understood that the specific terminology is not intended to be restrictive or confining and it is'to-he further understood that varions rearrangements of parts and modifications of structural detail may be'resorted to "without departing from the-scope or spirit oft-he invention as herein claimed; L I. In'a drill of the class described, ahead, a yoke having arms embracing said head and pivoted thereto intermediate their length, means on the outer ends of said arms for retaining a tool, and" means for engaging the outer side of the opposite end of one of said arms to'releasably secure said yoke in a pluof positions. a a In a drill of the class described, a head "slidably receiving a tool, a yoke including resilient arms pivoted to said headand rigid means on said head for engaging the outer side-of said arms to releasabl-y secure said yoke in "anyone of a plurality of positions. 3i In "a drill", a head havinga tool assocfa'ted therewith, a yoke having resilient arm's pivoted to'said" head, saidyoke including means: adapted to retain said tool in' said head when said yoke is in one" position and to rele'ase said tool when said yoke isin 'another-position, and ears on said head adapted tioen" ge' the outer sides of said arms to re leasa l y secure said yoke in' either of said positions.

4.1 In a: drill, ahead having a tool associi- 'ated therewith, recesses disposed in said head, aatool retaining yoke includinga pair of resilient arms having inwardly extending trunnions thereon adaptedto engage said recesses in said head, and means on said head for engaging the outer sides of said arms for restraining the same against expansion to thereby lock said trunnions in said recesses.

5. In a drill, a head having a tool asso ciated therewith, recesses disposed in said 'head, a yoke including a pair of resilient ated therewith, recesses disposed in said head, a tool retaining yoke including a pair of resilient arms-haying inwardly extending trunnions adapted to engage said recesses in saidhea'd, and means on said head for engagingthe outer sides of said arms for restraining the same again-st expansion, said means including notches for receiving said arms to releasabl y secure said yoke in any one of a plurality of positions. 7

7. Ina drill, a head havinga tool asso ciated therewith, recesses disposed in said head-,a yokeincIudi-ng a pair ofresi-lient arms carrying tool retaining means at one'end thereof and havinginwardly extending trunnio'ns; intermediate their length adapted to engage said-recesses in said head, and means on said head for engagin-gthe outer sides of the-free ends of said arms for restraining the same -again'st expansion, said means inending. notches for receiving said arms to releasably secure said yoke in any one ofa plurality of positions. 1 "8-. In a drill, a head having a toolasso' ciated therewith,atool retainer including a pair or; resilient arms adapted to embrace said head and having inwardly extending trunnions thereon, slotsinsaid head adapted to receive said trunnions; and recesses depressed from's'aid slots "and adapted to retain said trunnions to pi'votally mount said reta-ineron said head 1 .9. In a drill, a head having a tool associ ated therewith a tool retaining yoke including a pair ofresilient arms adapted to embracesaid head and having inwardly extending trunnions thereon, slots in said head adapted to receive sai'd trunnions and termi: nating in diametrically" opposed recesses adapted to receive trunnionsand pivota'll-y' mount said yoke onsaid head, and means on-=said head for engaging the outer sides oflsaid arms to restrain the same against expansion; f r

1!). In a drill, ahead having a tool associated therewith, a tool retaining yoke in cluding a' pair of resilient arms arranged to embrace said head aindhaving inward-1y ex,-

tending trunnions intermediate the length thereof, slots in said head to slidably receive said trunnions and terminating in diametrically opposed recesses arranged to pivotally receive said trunnions, and means on said head for engaging the outer sides of the free ends ofsaid arms to restrain the same against expanslon.

11. In a drill of the class described, a head, a yoke having arms embracing said head and pivoted thereto intermediate their length, means on the outer ends of said arms for retaining a tool, and means having an abutment thereon for engaging the outer side of the opposite end of one of said arms to releasably secure said yoke in a plurality of positions.

In testimony whereof I hereunto aifix my signature this 26th day of September, 1929.

GEORGE RAUBERSTRAUCH. 

